Creating Load Calculation Maps

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Load Calculation Maps allow you to improve the quality control process when checking your load calculations. This is accomplished by allowing you to visualize the distribution of the loads on the drawing in addition to viewing the numbers in a table such as was done when the load calculations were printed in the previous step of this tutorial.

To create a load calculation map, go to

DM HVAC arrow Load Calculations arrow Display Load Calculation Map

The Load Calculation Map dialog box will appear as shown below.

load_calc_map

Select Cooling System Load in the left-hand box and People in the right-hand box as shown below. The settings you will need to change are highlighted in yellow in the screen shot below.

cooling_people_loadmap

Press OK. Design Master HVAC will take you to the drawing and prompt you to specify the scale location. Click outside of the building to indicate the temporary placement of the scale key to aid in interpreting the map. Design Master HVAC will color fill each room in the building, as shown below.

cooling_map

Note that rooms with a higher BTUH per square foot, or a higher average people cooling load, are a lighter shade of blue, while rooms with a lower BTUH per square foot are a darker shade of blue. In particular, this map shows that the conference room, in white, has the highest people cooling load, while the storage room, in black, has the lowest people cooling load. This map allows a quality-control check to be performed at a glance.

To create another load calculation map, go again to

DM HVAC arrow Load Calculations arrow Display Load Calculation Map

The Load Calculation Map dialog box will appear. Set the specifications to match those shown below, then press OK. The settings you will need to change are highlighted in yellow in the screen shot below.

heating_total_BTUH_map

Design Master HVAC will update the load calculation map to reflect the most recent selections. The scale will be placed in the same location. Your drawing should match the one shown below.

dwg_heating_BTUH_map

Note that this load calculation map works on the same principles as the pervious one. Rooms with the highest heating load are light red and rooms with the lowest heading load are dark red. Thus, the conference room, in white, has the highest total heating load and the storage room, in black, has the lowest. To demonstrate the difference between the total heating load per room versus the average heating load per room, go to

DM HVAC arrow Load Calculations arrow Display Load Calculation Map

Set the Load Calculation Map dialog box to match the specifications highlighted below and press OK.

heating_total_BTUHsqft_map

Your drawing should now match the one shown below.

In the previous load map, the heating load in the conference room was white, indicating that it required the most total heating. The heating load in all of the offices were dark red, indicating a low total heating load.

In the new map below, the heating load in the conference room and offices are all shades of pink, indicating that the average heating load in the rooms is similar. When looking at the offices, you can see that Office 103 has the highest average heating load. That makes sense because it has a south facing exterior wall, as opposed to Office 105, which has only a west facing exterior wall.

If the average heating load for one of the offices were significantly different from the others, you would know that you should investigate that office to determine if it is properly defined. Thus, the load calculation map feature of Design Master HVAC makes it possible to graphically check for load calculation errors, rather than being required to scan the long lists of numbers in the printed output (although you can do that, too, for extra quality certainty, since Design Master HVAC also allows the load calculations to be printed, as was done in the Viewing and Printing Load Calculations step.)

dwg_heating_BTUHsqft_map

To clear the Load Calculation Map in order to move on with the design process, go to

DM HVAC arrow Load Calculations arrowErase Load Calculation Map

Design Master HVAC will erase the Load Calculation Map colors and the scale.

Congratulations! You now know how to perform the basic load calculation functions using Design Master HVAC.

See Diffusers for the next tutorial.


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